tengu_tui_optout_reasonA Claude Code feature flag, read out of the shipped bundle.
It was in the build from v2.1.143 and was gone by v2.1.242.
Feedback typed when opting out of the new fullscreen terminal UI is now actually submitted, not just measured
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.268 .
First seen v2.1.143
Last seen v2.1.241 22 Aug 2026, gone by v2.1.242
Builds 88 / 150 on this box, as of v2.1.309
Written about v2.1.268 first named in a changelog, 10 Sep 2026
v2.1.143 v2.1.309
In the changelogs
2
Releases whose published page names tengu_tui_optout_reason.
v2.1.268 10 Sep 2026
v2.1.268 10 Sep 2026
Gate readings
0
No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.
First cited
1
The earliest release whose published evidence quoted tengu_tui_optout_reason was v2.1.268 , 10 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Release Date The span that was quoted
v2.1.268 10 Sep 2026 tengu_tui_optout_reason
Presence across releases
2
Builds How many Dates Reading
v2.1.143 – v2.1.241 88 builds → 22 Aug 2026 ◆ in the build
v2.1.242 – v2.1.309 57 builds 24 Aug 2026 → 22 Oct 2026 ○ not in the build
Build by build
145
One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
Build Date State The record behind it
v2.1.143 · addedverdict: added · default object v2.1.144 · presentverdict: present · default object v2.1.145 · presentverdict: present · default object v2.1.146 · presentverdict: present · default object v2.1.147 · presentverdict: present · default object v2.1.148 · presentverdict: present · default object v2.1.149 · presentverdict: present · default object v2.1.150 · presentverdict: present · default object v2.1.152 · presentverdict: present · default object v2.1.153 · presentverdict: present · default object v2.1.154 · presentverdict: present · default object v2.1.156 · presentverdict: present · default object v2.1.157 · presentverdict: present · default object v2.1.158 · presentverdict: present · default object v2.1.159 · presentverdict: present · default object v2.1.160 · presentverdict: present · default object v2.1.161 · presentverdict: present · default object v2.1.162 · presentverdict: present · default object v2.1.163 4 Jun 2026 · presentverdict: present · default object v2.1.165 5 Jun 2026 · presentverdict: present · default object v2.1.166 5 Jun 2026 · presentverdict: present · default object v2.1.167 6 Jun 2026 · presentverdict: present · default object v2.1.168 6 Jun 2026 · presentverdict: present · default object v2.1.169 8 Jun 2026 · presentverdict: present · default object v2.1.170 9 Jun 2026 · presentverdict: present · default object v2.1.172 10 Jun 2026 · presentverdict: present · default object v2.1.173 11 Jun 2026 · presentverdict: present · default object v2.1.174 11 Jun 2026 · presentverdict: present · default object v2.1.175 12 Jun 2026 · presentverdict: present · default object v2.1.176 12 Jun 2026 · presentverdict: present · default object v2.1.177 13 Jun 2026 · presentverdict: present · default object v2.1.178 15 Jun 2026 · presentverdict: present · default object v2.1.179 16 Jun 2026 · presentverdict: present · default object v2.1.181 17 Jun 2026 · presentverdict: present · default object v2.1.182 18 Jun 2026 · presentverdict: present · default object v2.1.183 19 Jun 2026 · presentverdict: present · default object v2.1.185 20 Jun 2026 · presentverdict: present · default object v2.1.186 22 Jun 2026 · presentverdict: present · default object v2.1.187 23 Jun 2026 · presentverdict: present · default object v2.1.190 24 Jun 2026 · presentverdict: present · default object v2.1.191 24 Jun 2026 · presentverdict: present · default object v2.1.193 25 Jun 2026 · presentverdict: present · default object v2.1.195 26 Jun 2026 · presentverdict: present · default object v2.1.196 29 Jun 2026 · presentverdict: present · default object v2.1.197 30 Jun 2026 · presentverdict: present · default object v2.1.198 1 Jul 2026 · presentverdict: present · default object v2.1.199 2 Jul 2026 · presentverdict: present · default object v2.1.200 3 Jul 2026 · presentverdict: present · default object v2.1.201 3 Jul 2026 · presentverdict: present · default object v2.1.202 6 Jul 2026 · presentverdict: present · default object v2.1.203 7 Jul 2026 · presentverdict: present · default object v2.1.204 8 Jul 2026 · presentverdict: present · default object v2.1.205 8 Jul 2026 · presentverdict: present · default object v2.1.206 9 Jul 2026 · presentverdict: present · default object v2.1.207 10 Jul 2026 · presentverdict: present · default object v2.1.208 13 Jul 2026 · presentverdict: present · default object v2.1.209 14 Jul 2026 · presentverdict: present · default object v2.1.210 14 Jul 2026 · presentverdict: present · default object v2.1.211 15 Jul 2026 · presentverdict: present · default object v2.1.212 16 Jul 2026 · presentverdict: present · default object v2.1.213 17 Jul 2026 · presentverdict: present · default object v2.1.214 18 Jul 2026 · presentverdict: present · default object v2.1.215 19 Jul 2026 · presentverdict: present · default object v2.1.216 20 Jul 2026 · presentverdict: present · default object v2.1.217 21 Jul 2026 · presentverdict: present · default object v2.1.218 22 Jul 2026 · presentverdict: present · default object v2.1.219 24 Jul 2026 · presentverdict: present · default object v2.1.220 24 Jul 2026 · presentverdict: present · default object v2.1.221 3 Aug 2026 · presentverdict: present · default object v2.1.222 4 Aug 2026 · presentverdict: present · default object v2.1.223 5 Aug 2026 · presentverdict: present · default object v2.1.224 7 Aug 2026 · presentverdict: present · default object v2.1.225 7 Aug 2026 · presentverdict: present · default object v2.1.226 8 Aug 2026 · presentverdict: present · default object v2.1.227 10 Aug 2026 · presentverdict: present · default object v2.1.228 11 Aug 2026 · presentverdict: present · default object v2.1.229 12 Aug 2026 · presentverdict: present · default object v2.1.231 13 Aug 2026 · presentverdict: present · default object v2.1.232 13 Aug 2026 · presentverdict: present · default object v2.1.233 14 Aug 2026 · presentverdict: present · default object v2.1.234 17 Aug 2026 · presentverdict: present · default object v2.1.235 18 Aug 2026 · presentverdict: present · default object v2.1.236 19 Aug 2026 · presentverdict: present · default object v2.1.237 19 Aug 2026 · presentverdict: present · default object v2.1.238 20 Aug 2026 · presentverdict: present · default object v2.1.239 21 Aug 2026 · presentverdict: present · default object v2.1.240 22 Aug 2026 · presentverdict: present · default object v2.1.241 22 Aug 2026 · presentverdict: present · default object v2.1.242 24 Aug 2026 · removedverdict: removed
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags .
